王玉峰,蔡逸涛,肖丙建,周军,陈军.郯庐断裂西侧大井头钾镁煌斑岩中金刚石激光拉曼和红外光谱特征研究[J].西北地质,2020,53(1):35-48 WANG Yufeng,CAI Yitao,XIAO Bingjian,ZHOU Jun,CHEN Jun.Research of Characteristics on Laser Raman and Infrared Spectra of Diamonds in Dajingtou Lamproite, West of Tan-Lu Fault[J].Northwestern Geology,2020,53(1):35-48
郯庐断裂西侧大井头钾镁煌斑岩中金刚石激光拉曼和红外光谱特征研究
Research of Characteristics on Laser Raman and Infrared Spectra of Diamonds in Dajingtou Lamproite, West of Tan-Lu Fault
投稿时间:2019-06-09  修订日期:2019-07-01
DOI:10.19751/j.cnki.61-1149/p.2020.01.004
中文关键词:  金刚石;激光拉曼;红外光谱;钾镁煌斑岩;山东平邑
英文关键词:diamond;laser Raman;infrared spectra;lamproite;Pingyi area of Shandong province
基金项目:山东省地质矿产勘查开发局"山东省费县朱田地区金刚石普查"(KC2018007),江苏省自然科学基金面上项目"郯庐断裂西侧苏北地区碱性基性岩型金刚石及其包裹体对深部作用制约"(BK20191132),中国地质调查局"钦杭成矿带武宁-平江钨铜多金属矿地质调查"(DD20190153)项目联合资助
作者单位E-mail
王玉峰 山东省第七地质矿产勘查院, 山东 临沂 276006
山东省金刚石成矿机理与探测重点实验室, 山东 临沂 276006 
 
蔡逸涛 中国地质调查局南京地质调查中心, 江苏 南京 210016 cyitao@cgs.cn 
肖丙建 山东省第七地质矿产勘查院, 山东 临沂 276006
山东省金刚石成矿机理与探测重点实验室, 山东 临沂 276006 
 
周军 山东省第七地质矿产勘查院, 山东 临沂 276006
山东省金刚石成矿机理与探测重点实验室, 山东 临沂 276006 
 
陈军 山东省地质科学研究院, 山东 济南 250013  
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中文摘要:
      大井头岩体为郯庐断裂带西侧首个发现的含金刚石钾镁煌斑岩。笔者对其中的金刚石进行了激光拉曼和傅里叶可变红外光谱研究。其激光拉曼和红外光谱特征研究表明,测试的6颗金刚石可分为1a型和Ⅰb型2类,部分Ⅰb型金刚石叠加有Ⅰa型金刚石所特有的1 175 cm-1或1 182 cm-1吸收谱峰。根据测试金刚石的外貌特征和Ⅰb型初生金刚石向1a型金刚石转换的机制,认为大井头钾镁煌斑岩中的金刚石并非岩浆结晶成因,而是金刚石于地幔中率先形成,其后被超深源岩浆携带至地表,应属地幔捕掳晶成因。结合大井头地区优越的构造地质条件、金刚石重砂矿物异常及多处钾质超基性岩、火山角砾岩体的出露,认为该地区有望成为鲁西地区第四金刚石原生矿带。
英文摘要:
      Dajingtou pluton is the first diamondiferous lamproite discovered in the west of Tan-Lu fault zone. This paper studies the laser Raman and Fourier transform infrared spectra(FTIR) of the diamonds.The laser Raman and infrared spectrum data shows that the six diamonds from the Dajingtou lamproite can be distinguished into type Ia and type Ib. Some of the type Ib diamonds are superimposed on the type 1a with 1175 cm-1 or 1182 cm-1 absorption spectrum,which are unique to type Ia diamonds. According to the appearance features of the six tested diamonds and the conversion mechanism of type Ib to Type Ia, it is considered that diamonds in Dajingtou lamproite are not the cause of magma crystallization, but the mantle-derived xenocrysts, which were first formed in the mantle and then carried to the surface by ultra-deep magma. Taking into consideration of the excellent geological tectonic conditions, the abnormal heavy sand minerals in the diamonds, and the exposure of ultrabasic rocks and volcanic breccia, it is believed that this area is expected to be the fourth primary diamond belt in western Shandong.
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